iOS 的文字滚动条效果的实现

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(50, 100, 300, 50)];

label.text  = @"欢迎欢迎欢迎";

[self.view addSubview:label];

[label sizeToFit];

CGRect frame = label.frame;

frame.origin.x = 320;

label.frame = frame;

[UIView beginAnimations:@"testAnimation" context:NULL];

[UIView setAnimationDuration:8.8f];

[UIView setAnimationCurve:UIViewAnimationCurveLinear];

[UIView setAnimationDelegate:self];

[UIView setAnimationRepeatAutoreverses:NO];

[UIView setAnimationRepeatCount:999999];

frame = label.frame;

frame = label.frame;

frame.origin.x = -frame.size.width;

label.frame = frame;

[UIView commitAnimations];